Story related, Complete the fourth level ''Osgiliath'' in the ''Good Campaign/War of the Ring. There are 7 Objectives in this level which are as follows:

1. Rally to the east bank(Scout) 2. Kill the Orc assault party(Mage) 3. Mount a horse(Mage) 4. Capture the Sanctuary(Mage) (You get the chance of playing as Faramir after you've completed this objective.) 5. Rally to the Rangers(Faramir) 6. Escort Frodo to market square(Faramir) 7. Kill the trolls(Faramir)

After mounting a horse, watch the Fel Beasts swooping over the bridge and try to position yourself so they run into you. They will pick you up and this gives you one of the secret achievements.